Power supply voltage control system
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United States of America Patent
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Feb 21, 2017
Issued Date -
N/A
app pub date -
May 4, 2015
filing date -
May 12, 2014
priority date (Note) -
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Abstract
A system comprises a semiconductor integrated circuit including a data processing unit that operates in any of a plurality of states, and a selection unit that selects a state from the plurality of states in accordance with a voltage supplied from a power supply unit and makes the data processing unit operate in the selected state, and a power supply unit including a control unit that starts supplying a voltage to the semiconductor integrated circuit based on an initial voltage value setting at startup and makes a voltage to be supplied transit to a predetermined voltage based on information of voltage value in response to a supply voltage having reached the initial voltage value, wherein the selection unit switches the data processing unit to a predetermined state when a supplied voltage has reached the predetermined voltage value from the initial voltage value.
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